Garmin Xero C1 Pro Chronograph AI TACT 4 TATULA 300 features a 43mm TATULA 300 features a 43mm diameter spool that is 26 40 20 PU coated Nylon TRACKS RIFLES UP TO 1524 MPS 5000 FPS TRACKS BOWS AND CROSSBOWS UP TO 182 MPS 600 FPS TRACK PISTOLS UP TO 609 MPS 2000 FPS TRACKS AIR RIFLES UP TO 609 MPS 2000 FPS TRACKS AIRSOFT UP TO 304 MPS 1000 FPS TRACK OTHER PROJECTILES UP TO 1524 MPS 5000 FPS CALCULATES KINETIC ENERGY AT MUZZLE CALCULATES POWER FACTOR CALCULATES EXTREME SPREAD CALCULATES STANDARD DEVIATION CALCULATES STRING AVERAGE DELETE SHOTS IN STRING Device or app DECIMAL PRECISION ADD INDIVIDUAL SHOT NOTES yes (on ShotView™ app) ADD SESSION NOTES yes (on ShotView™ app) MARK SHOTS WITH CLEAN COLD BORE yes (on ShotView™ app) EXCLUDE SHOT FROM AVERAGE AND STANDARD DEV CALCULATIONS yes (on ShotView™ app) TRIPOD COMPATIBILITY yes (¼ 20 thread compatible) 000 shots or up to 6 hours gives you plenty of time at the range